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윤종민,오건승,이영명,박경진,이장욱,김승택 한국철도학회 2019 한국철도학회논문집 Vol.22 No.3
The accident rate of high-speed trains is quite low; however, train accidents cause severe damage. It is necessaryto have energy absorbing structures for frontal crash events of high-speed trains. Crash safety is dependent on theforce-displacement curve of the energy absorbing structures. In this study, the force-displacement curve of an energyabsorbing structure is determined by changing the thickness and shape of the structure. A meta-model based optimizationis employed in the design process. The sample points are obtained by Latin hypercube sampling (LHS), and analysisof mean (ANOM) is used to select the design variables. Radial basis function (RBF) is used to construct the metamodel. Size and shape optimizations are carried out and optimum solutions are discretized for manufacturability.
장기간 Magnesium sulfate를 투여한 토끼에서 Rocuronium의 근이완 효과
김교상,민형기,이건승 대한마취통증의학회 2007 Korean Journal of Anesthesiology Vol.52 No.4
Magnesium sulfate (MgSO4) has been used in the treatment of pre-eclampsia, hypertension and arrhythmia. This study was been conducted to evaluate the potency and time course of rocuronium-induced neuromuscular block after prolonged pretreatment with MgSO4 in rabbits. Methods: Forty rabbits were randomly assigned to two groups; the control group: normal saline 0.1 ml/kg sq for 6 weeks; and the study group: 50% MgSO4 60 mg/kg sq for 6 weeks. The dose-response relationships of rocuronium were studied during thiopental anesthesia in twenty rabbits. Each group received rocuronium 40, 60 and 80μg/kg rocuronium, respectively, and the time course of rocuronium, at 0.6 mg/kg, evaluated in the twenty rabbits in each group. Results: The mean serum magnesium concentration were 2.3-2.6 and 3.3-3.9 mEq/L in the control and study groups, respectively (P < 0.001). The calculated ED50s for rocuronium were 52.7 and 61.2μg/kg in the control and study groups, respectively (P < 0.05). The times after rocuronium administration until the 95% twitch recovery were 49.3 and 34.8 min in the control and study groups, respectively (P < 0.05). Conclusions: Rocuronium, following prolonged MgSO4 pretreatment had a decreased effect and short duration of action compared with the control, for which increased doses of nondepolarizing muscle relaxants would be required to obtain a similar effect.